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Add flooring division operator

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The $div and $mod cells use truncating division semantics (rounding
towards 0), as defined by e.g. Verilog. Another rounding mode, flooring
(rounding towards negative infinity), can be used in e.g. VHDL. The
new $divfloor cell provides this flooring division.

This commit also fixes the handling of $div in opt_expr, which was
previously optimized as if it was $divfloor.
This commit is contained in:
Xiretza 2020-04-21 12:51:58 +02:00
parent 17163cf43a
commit edd8ff2c07
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GPG key ID: 17B78226F7139993
19 changed files with 213 additions and 24 deletions
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4
passes/opt/share.cc
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@ -376,7 +376,7 @@ struct ShareWorker
continue;
}
if (cell->type.in(ID($mul), ID($div), ID($mod), ID($modfloor))) {
if (cell->type.in(ID($mul), ID($div), ID($mod), ID($divfloor), ID($modfloor))) {
if (config.opt_aggressive || cell->parameters.at(ID::Y_WIDTH).as_int() >= 4)
shareable_cells.insert(cell);
continue;
@ -1134,6 +1134,7 @@ struct ShareWorker
cone_ct.cell_types.erase(ID($mod));
cone_ct.cell_types.erase(ID($div));
cone_ct.cell_types.erase(ID($modfloor));
cone_ct.cell_types.erase(ID($divfloor));
cone_ct.cell_types.erase(ID($pow));
cone_ct.cell_types.erase(ID($shl));
cone_ct.cell_types.erase(ID($shr));
@ -1513,6 +1514,7 @@ struct SharePass : public Pass {
config.generic_bin_ops.insert(ID($sub));
config.generic_bin_ops.insert(ID($div));
config.generic_bin_ops.insert(ID($mod));
config.generic_bin_ops.insert(ID($divfloor));
config.generic_bin_ops.insert(ID($modfloor));
// config.generic_bin_ops.insert(ID($pow));